66515061601617 has 8 divisors (see below), whose sum is σ = 88686838135296. Its totient is φ = 44343329734512.

The previous prime is 66515061601561. The next prime is 66515061601661. The reversal of 66515061601617 is 71610616051566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66515061601617 - 2³⁶ = 66446342124881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66515061601617.

It is not an unprimeable number, because it can be changed into a prime (66515061601697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7522033 + ... + 13769934.

It is an arithmetic number, because the mean of its divisors is an integer number (11085854766912).

Almost surely, 2^{66515061601617} is an apocalyptic number.

It is an amenable number.

66515061601617 is a deficient number, since it is larger than the sum of its proper divisors (22171776533679).

66515061601617 is a wasteful number, since it uses less digits than its factorization.

66515061601617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22333287.

The product of its (nonzero) digits is 1360800, while the sum is 51.

The spelling of 66515061601617 in words is "sixty-six trillion, five hundred fifteen billion, sixty-one million, six hundred one thousand, six hundred seventeen".